Now showing items 41-50 of 168
Concept exploration - a tool for creating and exploring conceptual hierarchies
Concept exploration is a knowledge acquisition tool for interactively exploring the hierarchical structure of finitely generated lattices. Applications comprise the support of knowledge engineers by constructing a type lattice for conceptual graphs, and the exploration of large formal contexts in formal concept analysis.
Exploration tools in formal concept analysis
The development of conceptual knowledge systems specifically requests knowledge acquisition tools within the framework of formal concept analysis. In this paper, the existing tools are presented, and furhter developments are discussed.
Attribute exploration with background implications and exceptions
Implications between attributes can represent knowledge about objects in a specified context. This knowledge representation is especially useful when it is not possible to list all specified objects. Attribute exploration is a tool of formal concept analysis that supports the acquisition of this knowledge. For a specified context this interactive procedure determines a miminal list of valid implications between attributes of this context together with a list of objects which are counterexamples for all implications ...
Fast computation of concept lattices using data mining techniques
We present a new algorithm called TITANIC for computing concept lattices. It is based on data mining techniques for computing frequent itemsets. The algorithm is experimentally evaluated and compared with B. Ganter's Next-Closure algorithm.
A Modeling Analysis of Changing Global Land Use as affected by Changing Demands for Wood Products
The 21st century has brought new challenges for forest management at a time when globalization in world trade is increasing and global climate change is becoming increasingly apparent. In addition to various goods and services like food, feed, timber or biofuels being provided to humans, forest ecosystems are a large store of terrestrial carbon and account for a major part of the carbon exchange between the atmosphere and the land surface. Depending on the stage of the ecosystems and/or management regimes, forests ...
Dynamische Konfiguration verteilter Informationsverarbeitung in Gruppen heterogener Agenten
Das erfolgreiche Agieren von Multiagentensystemen (MAS) setzt eine umfangreiche und hochwertige Wissensbasis voraus. Die Wissensbasis umfasst die von einem Agenten benötigten Informationen, welche durch die Verarbeitung von Sensorinformationen erzeugt werden. Die Anpassung der Informationsverarbeitung an die Einsatzdomäne ermöglicht es, die Qualität der Wissensbasis zu gewährleisten und so die Leistung des MAS zu steigern. Aktuelle Middleware-Systeme unterstützen die Integration von gängigen Methoden und Verfahren ...
Conceptual structures represented by conceptual graphs and formal concept analysis
Conceptual Graphs and Formal Concept Analysis have in common basic concerns: the focus on conceptual structures, the use of diagrams for supporting communication, the orientation by Peirce's Pragmatism, and the aim of representing and processing knowledge. These concerns open rich possibilities of interplay and integration. We discuss the philosophical foundations of both disciplines, and analyze their specific qualities. Based on this analysis, we discuss some possible approaches of interplay and integration.
Acquiring expert knowledge for the design of conceptual information systems
Conceptual Information Systems unfold the conceptual structure of data stored in relational databases. In the design phase of the system, conceptual hierarchies have to be created which describe different aspects of the data. In this paper, we describe two principal ways of designing such conceptual hierarchies, data driven design and theory driven design and discuss advantages and drawbacks. The central part of the paper shows how Attribute Exploration, a knowledge acquisition tool developped by B. Ganter can be ...